Output Properties of Dual-Polarization IFOGs

Two-Port Noise Suppression in Dual-Polarization Interferometric Fiber-Optic Gyroscope

“…In dual-polarization IFOGs, the intensity of the two orthogonal polarizations is summed up directly at the PD, which we refer it as to "optical compensation." Assuming the two polarization are incoherent, the PN errors at reciprocal and nonreciprocal ports can be expressed as [5], [30] (11) where p rx,ry , q rx,ry and p nr x,nry , q nr x,nry are listed in Table 2; d is the degree of depolarization (DOP) before entering the loop; note that d = 0 for well depolarized light. Furthermore, C r 1 (C nr 1 ) and C r 4 (C nr 4 ) are diagonal terms and C r 2 (C nr 2 ) and C r 3 (C nr 3 ) are off-diagonal terms of the transmission matrices for counter-propagating beams meeting at the reciprocal port (nonreciprocal port); these coefficients are complex numbers.…”